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05-20-2023, 05:05 AM
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#1
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Member
Join Date: Mar 2023
Posts: 46
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Water heater drain plug leaking
My drain plug hole was really rusty and the plug only went in one revolution. It worked for a month but now I have a tiny stream spraying from it. I’m in my busiest time of year and haven’t had time to try to fix it. I need to know the size of tap I need to buy to fix the threads. Is it a standard size across all of these RV water heaters?
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05-20-2023, 08:34 AM
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#2
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Senior Member
Join Date: Aug 2019
Location: Eastern outskirts of Dallas, TX
Posts: 4,553
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1/2” npt
__________________
‘91 Ultrastar Champion‘02 Georgie Boy Landau 8.1l Workhorse
‘03 Jeep Wrangler TJ 2018 Jeep Wrangler JK toad
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05-20-2023, 08:55 AM
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#3
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Senior Member
Join Date: Apr 2019
Posts: 1,957
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05-20-2023, 09:03 AM
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#4
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Member
Join Date: Mar 2023
Posts: 46
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Quote:
Originally Posted by MrMark52
1/2” npt
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No way that’s right. It’s much bigger than that.
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05-20-2023, 09:18 AM
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#5
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Senior Member
Join Date: Jul 2014
Posts: 35,441
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If not 1/2 then 3/4 NPT.
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05-20-2023, 09:25 AM
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#6
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Senior Member
Fleetwood Owners Club Workhorse Chassis Owner
Join Date: Jun 2016
Location: On the continental divide
Posts: 2,622
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Should be 1/2-14 NPT.
I put a ball valve in mine so it's easier to drain.
Mike in Colorado
__________________
2004 Fleetwood Pace Arrow 37c, 8.1 gasser, (Jezebel) Ultra RV ECM / TCM, plugs wires, and rear track bar, PPE deep Tx pan w/ temp gage, Bilstein's, Sailun's & Sumo's all round, pushed by a 2002 Grand Caravan, on a Master Tow Dolly OR a WR-250 on a rail.
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05-20-2023, 09:30 AM
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#7
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Senior Member
Join Date: Feb 2022
Posts: 285
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Atwood. 1/2”
Suburban 3/4” anode
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05-20-2023, 10:47 AM
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#8
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Senior Member
Join Date: Apr 2019
Posts: 1,957
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A 1/2" NPT plug measures about 3/4". 1/2" refers to the internal size of 1/2" NPT pipe.
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05-20-2023, 11:22 AM
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#9
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Senior Member
Join Date: Nov 2015
Posts: 26,840
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Quote:
Originally Posted by Capacitor
Atwood. 1/2”
Suburban 3/4” anode
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YEP^^^^^
Atwood.....1/2" NPT
Suburban ....3/4" NPT
Hardware store.....brass nipple if Atwood & steel nipple if Suburban
Cut some 'slots' lengthwise in threads......3-4 slots then screw nipple in/out cleaning/chasing the drain hole threads
Taps are expensive unless you already have a set
Once threads are cleaned up......use a new Nylon plug/Atwood or Andoe Rod/Suburban (couple wraps of tape for anode rod)
__________________
I took my Medication today. HAVE YOU?
Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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05-20-2023, 08:37 PM
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#10
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Senior Member
Join Date: Jan 2020
Posts: 1,866
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Quote:
Originally Posted by TheDonger
No way that’s right. It’s much bigger than that.
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NPT threads are not sized like your regular UN threads where 1/2 bolt measures 1/2”. A 1/2” NPT thread will be approx 3/4”
__________________
2017 Fleetwood Bounder 36Y
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05-20-2023, 09:02 PM
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#11
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,961
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There's no need to buy a ˝ NPT tap, go to an AutoZone parts store and borrow one. They loan tools free. The way it works is, you ask to borrow a ˝ NPT tap, they copy down your CC number, your name and address and hand you the tool.
When you return the tool, they hand you the slip of paper back. If the tool is not returned they buy a new one and charge your CC.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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05-21-2023, 04:35 PM
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#12
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,961
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I forgot to say; only use a tap to clean out the threads, do not cut any metal out or the plugs will not seat enough to seal.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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